Distinguishing features:
Parent taxon (ntax_non_cocco):
This taxon: Typically spherically-radiate calcite bodies, formed of largish tapering, radiate elements with radial c-axes. Larger and less regularly-shaped than typical nannofossils.
Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
Angulolithina V or horseshoe shaped nannolith showing high birefringence and c-axis parallel to length of nannolith | |||||
Didemnum |
Taxonomy:
Catalog entries: Discoaster athanasiui * , Discoaster irregularis * , Discoaster mrazeci * , Discoaster multinucleatus * , Discoaster olteniae * , Discoaster pentaradiatus communis * , Discoaster pentaradiatus flosculoides * , Discoaster sabbae * , Discoaster slatiorensis * , Gongylis * , Gongylis salzwedelensia * , Heliodiscoaster cayeuxi * , Heliodiscoaster cernaensis * , Heliodiscoaster concentricus * , Heliodiscoaster deflandrei * , Heliodiscoaster irregularis * , Heliodiscoaster rumanus * , Hemidiscoaster triradiatus aquitanicus * , Micrascidites [no catalog entry yet], Micrascidites vulgaris [no catalog entry yet], Perforocalcinella * , Perforocalcinella fusiformis * , Perforocalcinella petali * , Tansinius * , Tansinius angularis * , Tansinius irregularis * , Tansinius olteniae * , Tansinius rectangularis * , Tansinius stefanescui *
Distinguishing features:
Parent taxon (ntax_non_cocco):
This taxon: Typically spherically-radiate calcite bodies, formed of largish tapering, radiate elements with radial c-axes. Larger and less regularly-shaped than typical nannofossils.
Morphology:
Size:
Geological Range:
Last occurrence (top): Extant. Data source:
First occurrence (base): within Jurassic Period (145.01-201.30Ma, base in Hettangian stage). Data source:
Bona, J. (1964). Coccolithophorida-vizsgalatok a meceski retegekben (Coccolithopohriden-Unntersuchungen in der neogen Schichtenfolge des Meeskggerbirges). Földtani Közlöny - Bulletin of the Hungarian Geological Society. 94: 121-131. gs Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs O Bown, P. R. (2010). Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research. 31(1): 11-38. gs O Deflandre, G. & Deflandre-Rigaud, M. (1956). Micrascidites manip. nov., sclerites de Didemnides (Ascidies, Tuniciers) fossiles due Lutétian du Bassin Parisien et du Balcombien d'Australia. Compte Rendu Sommaire des Séances de la Société Géologique de France. 1956: 47-48. gs O Filipescu, M. & Hanganu, E. (1960). Sur les Discoastérides du Tertiare du N-O de l'Olténie. Revue Roumaine de Géologie Géophysique et Géographie, Serie de Géologie. 4(2): 217-232. gs Hoffmann, N. (1970e). Taxonomische Untersuchungen an Coccolithen aus der Kreide Norddeutchlands anhand elektronenmikroskopischer Aufnamen. Hercynia. 7(1-3): 163-198. gs V O Lukowiak, M., Dumitriu, S. & Ionesi, V. (2016). First fossil record of early Sarmatian didemnid ascidian spicules (Tunicata) from Moldova. Geobios. 49: 201-209. gs Menini, A., Mattioli, E., Spangenberg, J. E., Pittet, B. & Suan, G. (2018). New calcareous nannofossil and carbon isotope data for the Pliensbachian/Toarcian boundary (Early Jurassic) in the western Tethys and their paleoenvironmental implications. Newsletters on Stratigraphy. -. gs Varol, O. & Houghton, S. D. (1996). A review and classification of fossil didemnid ascidian spicules. Journal of Micropalaeontology. 15: 135-149. gs V O Varol, O. (2006). Didemnid ascidian spicules from the Arabian Peninsula. Journal of Nannoplankton Research. 28(1): 35-56. gs O Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs V OReferences:
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Ascidian spicules compiled by Jeremy R. Young viewed: 2-7-2022
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